Chords for Samjhawan - Humpty Sharma Ki Dulhania | Varun Dhawan and Alia Bhatt - Arijit Singh, Shreya Ghoshal (). Spark is the smartest and most interesting app to learn and enjoy playing guitar. Spark is an all-around app for beginners and advanced players to learn any song with chords or master new skills with hundreds of lessons and games in Spark.